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It seems like you're right! There are known issues with using Bitwarden passkeys on Windows 10. Windows Hello on Windows 10 doesn't fully support the PRF (Password-Related Function) extension required for passkey authentication. This might be causing the "invalid passkey" error you're encountering.

One potential solution is to upgrade to Windows 11, which has better support for PRF-capable passkeys. Alternatively, you could try using a different method for logging in, such as two-factor authentication (2FA) with an authenticator app.
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Bitwarden uses the PRF (Password-Related Function) extension for passkeys to enhance security and functionality. Here are a few reasons why Bitwarden has chosen to implement PRF:

1. End-to-End Encryption: PRF allows Bitwarden to use passkeys for both authentication and encryption. This means that when you log in with a passkey, it not only verifies your identity but also helps encrypt and decrypt your data, ensuring that your information remains secure.

2. Client-Side Encryption: With PRF, Bitwarden can enable client-side encryption, giving users full control over their data. This means that sensitive information is encrypted on the user's device before being stored on Bitwarden's servers, ensuring that only the user can decrypt it.

3. Phishing Resistance: Passkeys are resistant to phishing attacks because they cannot be easily guessed or replicated. By using PRF, Bitwarden ensures that passkeys are used securely and only work for the official Bitwarden web app.

4. Identity Wallets: PRF can derive encryption keys for identity wallets, enabling secure storage and management of identity data. This adds an extra layer of security for users' personal information.

Overall, Bitwarden's use of PRF is aimed at providing stronger security, better data protection, and a more seamless user experience.